docs: def get_keys_to_action(self):
          """Return the dictionary of keyboard keys to actions."""
          # keyboard keys in an array ordered by their byte order in the bitmap
          # i.e. right = 7, left = 6, ..., B = 1, A = 0
          buttons = np.array([
              ord('d'),  # right
              ord('a'),  # left
              ord('s'),  # down
              ord('w'),  # up
              ord('\r'), # start
              ord(' '),  # select
              ord('p'),  # B
              ord('o'),  # A
          ])
          # the dictionary of key presses to controller codes
          keys_to_action = {}
          # the combination map of values for the controller
          values = 8 * [[0, 1]]
          # iterate over all the combinations
          for combination in itertools.product(*values):
              # unpack the tuple of bits into an integer
              byte = int(''.join(map(str, combination)), 2)
              # unwrap the pressed buttons based on the bitmap
              pressed = buttons[list(map(bool, combination))]
              # assign the pressed buttons to the output byte
              keys_to_action[tuple(sorted(pressed))] = byte
  
          return keys_to_action